Credit: Bob D'Amico/ABC; Amelie Mucci/LE/Splash News Online

A Bachelorette again!

After splitting with fiance Ed Swiderski, Jillian Harris has left his hometown of Chicago for her old apartment in Vancouver -- and she's dating again.

"It was the last thing I wanted to do," the reality star, 29, admits in the new Us Weekly (out now). "It's terrible to leave because the other person doesn't know what they want," Harris tells Us, adding she "fought very hard" to save the relationship.

As Harris endured what she called a "really sad summer," Swiderski, 31, has been spotted flirting with several women in Chicago post-split.

"He's not a bad guy," Harris (who recently went on a date with a local pro athlete) tells Us of her ex. "He's just not quite ready to grow up."

Read more of our exclusive catch-up with Harris --  and how pals say "she'll never move for another man" -- in the new Us Weekly, out now.